class Student {
  constructor(name, number) {
    this.name = name;
    this.number = number;
  }
  sayHi() {
    console.log(`姓名${this.name} , 学号 ${this.number}`)
  }
}

// 通过类声明对象/实例
const xialuo = new Student('夏洛', 100);
console.log(xialuo.name);
console.log(xialuo.number);